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Marisa Dieken

Marisa Dieken is an associate in Baker McKenzie's North America Antitrust & Competition Practice Group, based in Washington, DC. Marisa advises clients on a broad range of antitrust law issues before the Department of Justice, Federal Trade Commission, and foreign competition authorities. Prior to joining Baker McKenzie, Marisa worked for the US Department of Justice as a trial attorney. While at the DOJ, Marisa led pre-merger investigations in telecommunications, media, and technology sectors, and contributed to on a wide array of civil merger and conduct investigations. She also worked on litigation teams for the Division including US v. AT&T/Time Warner and US v. American Airlines/Jetblue.

In a notable turn of events, the Federal Trade Commission announced that it would abandon its in-house post-consummation challenge of the 2018 acquisition by Axon Enterprise, Inc. of VieVu, LLC. The FTC’s decision follows a recent adverse ruling from the Supreme Court, which held that parties are entitled to assert constitutional challenges against the FTC before being required to participate in its administrative proceedings. Following the Supreme Court’s decision, the FTC is likely to confront more challenges when pursuing enforcement actions—including, in particular, merger challenges—through its in-house administrative proceedings.